I know you have probably check ed everything . But have they checked your arms , shoulders and even for carpel tunnel in your wrists . they can all lead to neck strain. I would be checking your eyes , throat even teeth like wisdom teeth . good luck and keep us posted . Roz

even sitting at the computer

Syringomyelia T4-T10

Chiari Malformation

Decompression Surgery 1999

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I does sound like something is causing your pain more than a pulled muscle. You have something pinching a nerve somewhere. It's up to your doctor to find out what it is and form a treatment plan. It could be pinching at the neck area, or like suggested at the wrist (carpul tunnel), or a myriad of other places. Guessing is only delaying treatment and prolonging your pain. Make an appointment with your doc and get some relief.